Lawn mower



FIG. 1 is a left side perspective view of a lawn mower showing my new design;

FIG. 2 is a left front perspective view thereof;

FIG. 3 is a right side perspective view thereof;

FIG. 4 is a front perspective view thereof;

FIG. 5 is a rear perspective view thereof. 

The ornamental design for a lawn mower, substantially as shown. 